Hello pyrochild,
for the first try I made some simple stick-figures and curves (black at white at Paint.NET, Final Release Build 3.510.4297.28964 / Win7) and than I start the
installed plugin "grid-warp". I've changed some settings (more grid-lines and points, horizontaly & verticaly) and deformed the grid a little bit. But after I had
pressed the O.K-button the work "leaves" me (sorry, I don't know the right word here) without any effect. But I tried it once more with the option: Effects > repeat grid-warp.
Finally that makes the work come true (or "really")! Please have a look at the topic "Grid Warp" #29 (at page 2; yoggysot and my answer, #30) too. I think yoggysot had
a problem similar to mine (my one).
("The other ones I've not tested yet" means the other plug-ins of your Plug-in Pack)
Alexander